Tail-thread-cutting mechanism in automatic looms



July 23, 1929. K TQYODA 1 722,l84

TAIL THREAD cuw'rme MECHANISM IN AUTOMATIC LOOMS Filed April 11, 1927 3 Sheets-Sheet 1 I N VEN TOR.

I A TTORNEY.

3 Sheets-Sheet 2 ATTORNEY.

K. TOYODA July 23, 1929.

TAIL THREAD CUTTING MECHANISM IN AUTOMATIC LOOMS Filed April 11, 1927 July 23, 1929.

K. TOYODA 1,722,184

TAIL THREAD CUTTING MECHANISM IN AUTOMATIC LOOMS Filed April 11, 1927 3 Sheets-Sheet I N VEN TOR.

A TTORNE Y.

' Patented July 23, 1929.

, UNITED STATES KIIOHIRO TOYODA, OF SHIRAKABECHO, NAGOYA, JAPAN.

TAIL-THBEAD-CUTTING MECHANISM IN AUTOMATIC LOOMS.

Application filed April 11,

My invention relates to a mechanism for cut-ting the tails of the filling thread left at the selvageof a fabric upon the weft replen ishing operation in an automatic loom.

In the old'devices employing a continuously moving cutter, the latter is subjected to continuous wear so that it must be frequently renewed. The object of the present invention is to overcome such disadvantage and to provide a mechanism wherein the cutter is effectively actuated only twice immediately after the completion of the weft replenishing operation, and the cutter being normally held inoperative, so that the cutter is not subjected to continuous wear and therefore can be used for a long time.

In the drawings, illustrating what I now consider the preferred form of my invention,

'Figure 1 is a side view of certain parts of an automatic 100m comprising my new mechanism; 7 I

Figure 1 shows a continuation of the rod 8 with the operatingmechanism therefor.

. Figure 2 is a plan view thereof, and

Figure 3 a fragmentary view similar to Figure 1, showing the cutting mechanism in its operative position.

In the "drawings,- 1 is the slay, 2 the slay sword, and 3 a projecting engaging member attached thereto. J ournalled in the loom frame (shown in chain lines) is a shaft 4 which is operatively connected to the shuttle ejectin rod (not shown in the drawings), and it Connected to the lower end of the operating lever 5 is a receiving rod 6 adapted to cooperate with the engaging member 3.' Thisreceiving rod is operatively connected to weft detecting devices, and is normallybelow the path of the engaging member 3 on the slay sword, as shown in full lines inFigure 1, but is raised upon the breaking or failure of the filling threads, to the position shown in chain lines. Thus, as the slaymoves forward, the

said receiving rod 6 will be actuated by the projecting engaging member 3, and will rotate the operating ever 5 nto the position shown in chain lines, actuating the shuttle ejecting rod to effect the transfer of a fresh 5Q shuttle. a

To the fulcruin pin 7 connecting the receiving rod 6 and the operating lever 5 is con-' nected the forward end of t e operatin bar 8. The other end of said bar is sli ably mounted upon a block 10 which is pivotall b ,mounted on a part 9 bf the frame. The bloc has an operating lever 5 fixed thereto.

position.

the completion of the shuttle changing oper- 1927. serial No. 182,776.

10 is engaged bya cam 12 fixed on the tappet shaft 11, and is adapted to be raised or lowered thereby. The cam 12 is designed in such a manner that the block 10 is held in its raised position during one half rotation of the cam and then in its lowered position during the remaining half rotation of the cam.

It should be noted that the slay makes two beats during onerotation of cam 12. A hook 28 is mounted at an intermediate point of the operating bar 8. On the rear side of the slay sword is attached an engaging member 29 adapted to engage with the hook 28. As the cam 12 rotates, the block 10 will be oscillated up and down, thereby raising and lowering the operating bar 8 together with the hook 28. As previously mentioned, this moyement takes place in such a manner that the operating bar 8 is held in raised position during one half rotation of the cam and then held in lowered position during the remaining half rotation of the cam.

During a shuttle changing operation, as the lever 5 and rod 6 are brought to the opera ative position as shown in chain lines in 'Fig.

1, the'hook 28 will be also brought to its position shown in chain lines. Therefore, upon the first backward movement of the slay" sword, the engaging member 29 thereon will not engage with the hook 28 which is held raised by the cam, so that the operating lever remains in the position shown in chain lines.

During the next half rotation of the cam 12,

hook 28, thereby actuating the operatingbar 8 to retract the operating lever 5 to the normal Thus, it will be seen that, after ation, the operating lever 5 is still held in its operative position during two forward beats of the slay.

Mounted on the 'breast beam 13 is a shaft 14, towhich are fixed a latch 15 and a lever 16.- To the lever 16 is connected a link 17 which in turn is connected to the operating lever 5 by means of a slot 18 in the link and a pin 19 on the operating lever 5. The latch 15 is provided with a-hook 20 and is normally raised by meansof a spring 21'. I

As the operating lever 5 is moved to its operative position as shown in chain lines in Figure 1, it pulls down the link 17, whereby the latch 15 will be pulled downwardly against the action of the spring 21. As the operating lever 5 returns to its normal position, the latch 15 will also be returned to its raised position under the action of the spring 21.,

Mounted on the temple rod 22 is a temple 23. Slidably mounted on one end of the temple 23 is a thread cutter 24 for cutting tail threads, which cutter is adapted to be pushed outwardly by the action of a spring 26 connected to the engaging lever 25. But normally the cutter 24 is held retracted by the engagement of the hook 20 on the latch 15 with the engaging lever 25. Attached to the front side of the slay-is a leather pad 27 adapted to engage with the lever 25.

The operation of the invention is briefly as follo.ws:

When the weft detecting. mechanism calls for a change of shuttle, the operating lever 5 is rotated to its operative position as shown in chain lines in Figure 1. Then, the latch 15 being pulled downwardly releases the en-. gaging lever 25, whereby the cutter 24 is pushed outwardly, as shown in Figure 3. At the end of the forward movement of the slay, the leather pad 27 will enga e with and push the engaging lever 25, thereIJy actuating the cutter 24 inwardly against the action of the spring 26. Thus, the cutter cuts the tail of the weft thread left at the selvage of. the fabric.

As the operating lever 5 returns to the normal position, the latch 15 will be raised so that upon the next forward movement of the slay the engaging lever 25 will be caught by the hook 20 on the latch 15, whereby the cutter 24 is again held in normal position.

Now, as hereinbefore described, the operating lever 5 is made to still remain in its operative position during one rotation of cam 12 after the initiation of the weft replenishing operation. Consequently, the latch 15 still remains in its lowered position also for one rotation of the cam after the weft replenishing operation is initiated, and it returns to its raised position upon next rotation of the cam since the part 29 does not engage hook 28 on the first backward beat after the replenishing operation has been initiated. Thus, it will be seen that according to this in vention the cutter 24 operates only twice, first to cut the tail thread leading to the exhausted shuttle, and second to cut the tail thread left by the fresh shuttle, the cutter being normally held in the inoperative position. As apparent from the foregoing, the cutter 24 is not subjected to continuous wear, since it does not partake of any unnecessary movement as in the earlier devices.

lVhilst I have described the invention as applied to the automatic loom of the shuttlechanging type, it is to be understood that the invention is equally applicable to the automatic loom of the cop-changing type.

What I claim is 1. In an automatic loom comprising a weftreplenishing mechanism, the combination with the slay and the temple, of a thread cutter slidably mounted in said temple, an engaging lever in the pathv of said slay connected to said cutter, a means connected to said engaging lever for pushing out said cu'tter, an operating lever forming a part of said weft replenishing device, a latch operatively connected with said operating lever and normally engaging said engaging lever for hold ing said cutter in its inoperative position, said 4 operating lever when moved to its operative position causing said latch to release said engaging lever, means including a cam for returning the operating lever and the latch to normal position after two forward beats of the slay and thereby causing said cutter to be twice operated by the slay by means of said engaging lever so as to c'u-tthe tail thread leading to the exhausted shuttle and the threat left by the fresh shuttle.

2. The combination as specifiedin claim- 1 including an operating bar for said operating "lever held in raised position for one-half revolution of said cam, said bar carrying a hook adapted to be engaged by an engaging member upon the slay.

In testimony whereof I aflix my signature.

' KIICHIRO TOYODA.

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